It was supposed to be a family day out on the lake,  but Mom and Dad’s car broke down

It was supposed to be a family day out on the lake,  but Mom and Dad’s car broke down on the way,  and that left just me and my Sister out on boat.  I’d always thought my Sister was hot,  but seeing her in that bathing suit was driving me over the edge and I’d been fighting off hard ons all day.

Well after a couple hours I finally lost the battle and had a full fledged tent going on in my bathing suit.  I was going to jump in the water because I really had no better place to try and hide it,  but before I could she noticed.  "Are you hard?“ she asked me with a chuckle.  "It’s OK,  don’t be ashamed it happens to everyone,”  she said as she leaned closer to me,  seemingly with the point of giving me a even better view of her magnificent tits.

“You know,”  she said with a smile on her face,  "we are all alone out here and I certainly wouldn’t mind a little ‘stimulation’…“